问题
Possible Duplicate:
How to refresh Android listview?
I am looking for using Refresh button refreshing the listview data.. DES:In my app there is refresh button when i onclick on it Listview data which coming from server must get refresh & show update listview data.
And I have no idea how to do that. plz suggest me with example.. Thanks in advance. below is my code.
Mainactivity.java
listView = (ListView) findViewById(R.id.homelistView);
listView.setTextFilterEnabled(true);
final EfficientAdapter objectAdapter = new EfficientAdapter(this);
listView.setAdapter(objectAdapter);
Button refreshButton= (Button)findViewById(R.id.refreshButton);
refreshButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
objectAdapter.notifyDataSetChanged();
}
});
EfficientAdapter.java
public static class EfficientAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private Context context;
public EfficientAdapter(Context context) {
mInflater = LayoutInflater.from(context);
this.context=context;
}
public int getCount() {
return CountriesList.name.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.homemplebrowview, null);
holder = new ViewHolder();
holder.text1 = (TextView) convertView
.findViewById(R.id.name);
holder.text2 = (TextView) convertView
.findViewById(R.id.mrn);
holder.text3 = (TextView) convertView
.findViewById(R.id.date);
holder.text4 = (TextView) convertView
.findViewById(R.id.age);
holder.text5 = (TextView) convertView
.findViewById(R.id.gender);
holder.text6 = (TextView) convertView
.findViewById(R.id.wardno);
holder.text7 = (TextView) convertView
.findViewById(R.id.roomno);
holder.text8 = (TextView) convertView
.findViewById(R.id.bedno);
holder.btnList = (Button)convertView.findViewById(R.id.listbutton);
// holder.btnList.setOnClickListener(this);
holder.btnList.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent next=new Intent(context, SeviceDetails.class);
context.startActivity(next);
}
});
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.text1.setText(CountriesList.name[position]);
holder.text2.setText(CountriesList.mrn[position]);
holder.text3.setText(CountriesList.actualstart[position]);
holder.text4.setText(CountriesList.age[position]);
holder.text5.setText(CountriesList.gender[position]);
holder.text6.setText(CountriesList.wardNo[position]);
holder.text7.setText(CountriesList.roomNo[position]);
holder.text8.setText(CountriesList.bedNo[position]);
return convertView;
}
static class ViewHolder {
public Button btnList;
public TextView text8;
public TextView text7;
public TextView text6;
public TextView text5;
public TextView text4;
public TextView text1;
public TextView text2;
public TextView text3;
}
@Override
public void notifyDataSetChanged() // Create this function in your adapter class
{
super.notifyDataSetChanged();
}
}
}
回答1:
Add new values in your adapter and call notifyDataSetChanged .
Follow the step to update listview.
1) First Add new values to your CountriesList .
2) Before Assign EfficientAdapter to listiew, make one object of it and then assign that object.
3) Create one function in your EfficientAdapter class called notifyDataSetChanged().
4) Call notifyDataSetChanged() function using EfficientAdapter object.
Example
EfficientAdapter objectAdapter = new EfficientAdapter(this);
listView.setAdapter(objectAdapter);
@Override
public void notifyDataSetChanged() // Create this function in your adapter class
{
super.notifyDataSetChanged();
}
Now call objectAdapter.notifyDataSetChanged() on onClick event of refresh button.
回答2:
You can do something like this
public class Mainactivity extends Activity{
ListView listView;
EfficientAdapter objectAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.mainlayout);
listView = (ListView) findViewById(R.id.homelistView);
listView.setTextFilterEnabled(true);
objectAdapter = new EfficientAdapter(this);
listView.setAdapter(objectAdapter);
Button refreshButton= (Button)findViewById(R.id.refreshButton);
refreshButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
objectAdapter = new EfficientAdapter(Mainactivity.this);// adapter with new data
listView.setAdapter(objectAdapter);
objectAdapter.notifyDataSetChanged();
}
});
}
}
This is a sample of what I want to tell you:
public class second extends Activity{
ListView listView;
ArrayAdapter<String> adapter;
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
listView=(ListView) findViewById(R.id.listView1);
button=(Button) findViewById(R.id.button1);
String[] planets = new String[] { "Mercury", "Venus", "Earth", "Mars",
"Jupiter", "Saturn", "Uranus", "Neptune"};
ArrayList<String> planetList = new ArrayList<String>();
planetList.addAll( Arrays.asList(planets) );
// Create ArrayAdapter using the planet list.
adapter = new ArrayAdapter<String>(this, R.layout.simplerow, planetList);
listView.setAdapter(adapter);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String[] planets = new String[] { "Mercury m", "Venus m", "Earth m", "Mars m",
"Jupiter m", "Saturn m", "Uranus m", "Neptune m"};
ArrayList<String> planetList = new ArrayList<String>();
planetList.addAll( Arrays.asList(planets) );
adapter = new ArrayAdapter<String>(second.this, R.layout.simplerow, planetList);
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
});
}
}
Where R.layout.simplerow:
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rowTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:textSize="16sp" >
</TextView>
and R.layout.second:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</ListView>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</RelativeLayout>
回答3:
You have to add new values to CountriesList and call notifyDataSetChanged() API.
回答4:
Button refreshButton= (Button)findViewById(R.id.refreshButton);
refreshButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
/*Intent next=new Intent(MainActivity.this, SeviceDetails.class);
startActivity(next);*/
Do a notifyDataSetChanged();
}
});
Click for More Info
来源：https://stackoverflow.com/questions/12453290/refresh-button-onclick-listview-data-must-get-update-in-android